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Stock compensation and other employee benefit plans - Outstanding option awards (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Outstanding, beginning balance, Shares | shares 8,524,997
Granted, Shares | shares 2,107,500
Exercised, Shares | shares (2,838,464)
Forfeited and expired, Shares | shares (255,768)
Outstanding, ending balance, Shares | shares 7,538,265
Vested or expected to vest in the future, Shares | shares 7,538,265
Exercisable , Shares | shares 4,253,458
Outstanding beginning balance, Weighted average exercise price | $ / shares $ 0.23
Granted, Weighted average exercise price | $ / shares 8.14
Exercised, Weighted average exercise price | $ / shares 0.11
Forfeitures and expired, Weighted average exercise price | $ / shares 0.48
Outstanding ending balance, Weighted average exercise price | $ / shares 2.48
Vested or expected to vest in the future, Weighted average exercise price | $ / shares 2.48
Exercisable , Weighted average exercise price | $ / shares $ 0.24
Outstanding , Weighted average remaining contractual term (years) 7 years 4 months 28 days
Vested or expected to vest in the future, Weighted average remaining contractual term (in years) 7 years 4 months 28 days
Exercisable, Weighted average remaining contractual term ( in years) 6 years 2 months 23 days
Outstanding , Average intrinsic value | $ $ 39,500
Vested or expected to vest in the future, Aggregate intrinsic value | $ 39,500
Exercisable , Average intrinsic value | $ 31,139
Stock-based compensation cost not yet recognized | $ $ 10,301
Weighted-average remaining expense recognition period (in years) 5 years 10 days